当胚发育到4—6个细胞时，在胚囊珠孔瑞的游离核之间先形成细胞壁。细胞壁的形成是以自由壁的方式从珠孔端到合点端自外向内进行。
The free cell wall formation occurs first in the micropylar end when the embryo is 4-6 celled stage, then to the chalazal end and the center.
对甘蓝型油菜隐性上位细胞核雄性不育纯合两型系、临保系和全不育系的转育方法进行了介绍。
The paper introduces the breeding methods of the homozygous two-type line, temporary maintainer line and complete sterile line with a recessive epistasis nuclear male sterile.
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